MarkWest Energy Partners Provides Update Regarding May 28 Incident at Its Houston Complex

DENVER--()--MarkWest Energy Partners, L.P. (NYSE: MWE) (“MarkWest” or “the Partnership”) reported an incident at its Houston processing and fractionation complex in Houston, Pennsylvania at approximately 6:00 p.m. (EDT) yesterday. The Houston complex consists of processing plants I, II and III totaling 355 million cubic feet per day (MMcf/d) of capacity and 98,000 barrels per day of ethane and heavier fractionation capacity with associated storage facilities and other related infrastructure. There were no reported injuries and as a precaution, the area was safely and temporarily evacuated.

Although MarkWest has not completed a full assessment of all plant equipment, an initial visual assessment of damage indicates that the impact was limited to one component of the plant III facility. The entire complex remains shut down until the assessment is completed. At this time, it appears that no other equipment at the facility was affected. Additionally, there are no apparent signs or evidence of a fire. The complex’s safety control system worked as designed and the two flares at the facility remained in operation throughout the course of this event.

MarkWest is working closely with its producer customers and is currently routing some gas through its rich-gas header system to the Majorsville complex in Marshall County, West Virginia. The Majorsville complex currently consists of 870 MMcf/d of processing capacity.

MarkWest would like to thank the local first responders and Washington County emergency management personnel who acted quickly and decisively to ensure the public’s safety. MarkWest notified the appropriate government officials and agencies. The area will remain secure until the review is completed.

MarkWest Energy Partners, L.P. is a master limited partnership engaged in the gathering, processing and transportation of natural gas; the gathering, transportation, fractionation, storage and marketing of natural gas liquids; and the gathering and transportation of crude oil. MarkWest has a leading presence in many unconventional gas plays including the Marcellus Shale, Utica Shale, Huron/Berea Shale, Haynesville Shale, Woodford Shale and Granite Wash formation.

This press release includes “forward-looking statements.” All statements other than statements of historical facts included or incorporated herein may constitute forward-looking statements. Actual results could vary significantly from those expressed or implied in such statements and are subject to a number of risks and uncertainties. Although MarkWest believes that the expectations reflected in the forward-looking statements are reasonable, MarkWest can give no assurance that such expectations will prove to be correct. The forward-looking statements involve risks and uncertainties that affect operations, financial performance, and other factors as discussed in filings with the Securities and Exchange Commission (SEC). Among the factors that could cause results to differ materially are those risks discussed in the periodic reports filed with the SEC, including MarkWest’s Annual Report on Form 10-K for the year ended December 31, 2013. You are urged to carefully review and consider the cautionary statements and other disclosures made in those filings, specifically those under the heading “Risk Factors.” MarkWest does not undertake any duty to update any forward-looking statement except as required by law.

Contacts

MarkWest Energy Partners, L.P.
Frank Semple, 866-858-0482
Chairman, President & CEO
or
Nancy Buese, 866-858-0482
Executive VP & CFO
or
Josh Hallenbeck, 866-858-0482
VP of Finance & Treasurer
investorrelations@markwest.com

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Contacts

MarkWest Energy Partners, L.P.
Frank Semple, 866-858-0482
Chairman, President & CEO
or
Nancy Buese, 866-858-0482
Executive VP & CFO
or
Josh Hallenbeck, 866-858-0482
VP of Finance & Treasurer
investorrelations@markwest.com